From: Joakim Tjernlund <Joakim.Tjernlund@infinera.com>
To: "linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: ttyACM: disabled by hub (EMI?), re-enabling... Causes garbage chars & disconnect
Date: Mon, 25 May 2020 14:46:09 +0000 [thread overview]
Message-ID: <6a4fe396ab5ae6cda548e904c57bc823103999d7.camel@infinera.com> (raw)
Every now and then I see in dmesg:
[Wed May 20 14:03:16 2020] cdc_ether 1-6.2:1.0 usb0: unregister 'cdc_ether' usb-0000:00:14.0-6.2, CDC Ethernet Device
[Wed May 20 14:03:25 2020] usb usb1-port6: disabled by hub (EMI?), re-enabling...
[Wed May 20 14:03:25 2020] usb 1-6: USB disconnect, device number 85
[Wed May 20 14:03:25 2020] cdc_acm 1-6.3:1.1: acm_ctrl_irq - usb_submit_urb failed: -19
[Wed May 20 14:03:25 2020] usb 1-6-port2: attempt power cycle
[Wed May 20 14:03:26 2020] usb 1-6.3: USB disconnect, device number 86
[Wed May 20 14:03:26 2020] cdc_acm 1-6.3:1.1: failed to set dtr/rts
[Wed May 20 14:03:26 2020] usb 1-6: new high-speed USB device number 94 using xhci_hcd
[Wed May 20 14:03:27 2020] hub 1-6:1.0: USB hub found
[Wed May 20 14:03:27 2020] hub 1-6:1.0: 3 ports detected
[Wed May 20 14:03:27 2020] usb 1-6.2: new high-speed USB device number 95 using xhci_hcd
[Wed May 20 14:03:27 2020] cdc_ether 1-6.2:1.0 usb0: register 'cdc_ether' at usb-0000:00:14.0-6.2, CDC Ethernet Device, 7e:1d:06:c0:3f:3c
[Wed May 20 14:03:27 2020] usb 1-6.3: new high-speed USB device number 96 using xhci_hcd
[Wed May 20 14:03:27 2020] cdc_acm 1-6.3:1.1: ttyACM0: USB ACM device
This (EMI?) disconnect causes 2 things.
1) I loose the TTY temporarily and have to reconnect.
2) After reconnect there are garbage chars on the gadget side, such as:
h�^@^@� ^@^@� ^@
or
X���)H��4Ğ^���
which causes confusion on for the tty/bash on the gadget.
The disconnect is mostly just annoying but the garbage chars are a major pain, one cannot trust
that cmds are understod. Is there a bug in ttyACM driver causing these?
Jocke
next reply other threads:[~2020-05-25 14:46 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-25 14:46 Joakim Tjernlund [this message]
2020-05-25 15:02 ` ttyACM: disabled by hub (EMI?), re-enabling... Causes garbage chars & disconnect Oliver Neukum
2020-05-25 15:15 ` Joakim Tjernlund
2020-05-25 16:49 ` Joakim Tjernlund
2020-05-26 8:47 ` Oliver Neukum
2020-05-26 8:59 ` Joakim Tjernlund
2020-05-26 10:14 ` Oliver Neukum
2020-05-26 16:46 ` Joakim Tjernlund
2020-05-26 17:19 ` Joakim Tjernlund
2020-05-27 8:38 ` Oliver Neukum
2020-05-27 9:40 ` Joakim Tjernlund
2020-05-27 10:12 ` Greg KH
2020-05-27 10:41 ` Oliver Neukum
2020-05-27 13:16 ` Joakim Tjernlund
2020-05-27 15:41 ` Joakim Tjernlund
2020-06-05 10:09 ` Joakim Tjernlund
2020-06-08 9:13 ` Oliver Neukum
2020-06-08 11:39 ` Joakim Tjernlund
2020-06-08 15:40 ` Oliver Neukum
2020-06-08 16:00 ` Joakim Tjernlund
2020-06-08 19:21 ` Oliver Neukum
2020-06-15 11:01 ` Joakim Tjernlund
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